Guarantor/Non Guarantor Condensed Consolidated Financial Statements (Statements of Operations (Unaudited)) (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2015	Jun. 30, 2014
Condensed Financial Statements, Captions [Line Items]
Revenues	$ 135,011	$ 259,812		$ 328,825	$ 498,846
Costs and expenses:
Operating Costs	85,921	166,598		216,985	322,088
Depreciation and amortization	38,489	45,791		80,271	91,317
General and administrative	18,363	25,276		40,223	49,759
Intercompany leasing	0	0		0	0
Bad debt expense	394	561		713	437
Impairment charges	71,329	0		77,319	0
Gain on dispositions of property and equipment	(4,377)	(331)		(3,244)	(1,731)
Gain on litigation	0	0		0	2,876
Total costs and expenses	210,119	237,895		412,267	458,994
Income (loss) from operations	(75,108)	21,917		(83,442)	39,852
Other income (expense):
Equity in earnings of subsidiaries	0	0		0	0
Interest expense, net of interest capitalized	(5,245)	(10,728)		(10,700)	(23,116)
Loss on extinguishment of debt	0	(14,595)	$ (7,900)	0	(22,482)
Other	486	2,017		(2,194)	1,815
Total other (expense) income	(4,759)	(23,306)		(12,894)	(43,783)
Income (loss) before income taxes	(79,867)	(1,389)		(96,336)	(3,931)
Income tax (expense) benefit	2,586	1,070		7,036	1,033
Net loss	(77,281)	(319)		(89,300)	(2,898)
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Revenues	120,933	234,285		294,786	451,155
Costs and expenses:
Operating Costs	74,907	149,539		190,443	290,304
Depreciation and amortization	34,367	41,979		72,044	83,843
General and administrative	12,118	17,438		28,373	34,636
Intercompany leasing	(1,215)	(1,215)		(2,430)	(2,430)
Bad debt expense	394	561		713	437
Impairment charges	15,447			21,437
Gain on dispositions of property and equipment	(4,359)	(186)		(3,223)	(1,464)
Gain on litigation					0
Total costs and expenses	131,659	208,116		307,357	405,326
Income (loss) from operations	(10,726)	26,169		(12,571)	45,829
Other income (expense):
Equity in earnings of subsidiaries	(62,574)	3,512		(67,163)	4,087
Interest expense, net of interest capitalized	(118)	(24)		(122)	(17)
Loss on extinguishment of debt		0			0
Other	419	617		871	1,288
Total other (expense) income	(62,273)	4,105		(66,414)	5,358
Income (loss) before income taxes	(72,999)	30,274		(78,985)	51,187
Income tax (expense) benefit	2,491	(10,567)		3,014	(18,595)
Net loss	(70,508)	19,707		(75,971)	32,592
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Revenues	14,078	25,527		34,039	47,691
Costs and expenses:
Operating Costs	11,014	17,059		26,542	31,784
Depreciation and amortization	3,776	3,456		7,532	6,849
General and administrative	698	1,176		1,366	1,864
Intercompany leasing	1,215	1,215		2,430	2,430
Bad debt expense	0	0		0	0
Impairment charges	56,632			56,632
Gain on dispositions of property and equipment	(18)	(145)		(21)	(267)
Gain on litigation					0
Total costs and expenses	73,317	22,761		94,481	42,660
Income (loss) from operations	(59,239)	2,766		(60,442)	5,031
Other income (expense):
Equity in earnings of subsidiaries	0	0		0	0
Interest expense, net of interest capitalized	8	3		12	7
Loss on extinguishment of debt		0			0
Other	207	1,531		(2,796)	793
Total other (expense) income	215	1,534		(2,784)	800
Income (loss) before income taxes	(59,024)	4,300		(63,226)	5,831
Income tax (expense) benefit	(3,550)	(788)		(3,937)	(1,744)
Net loss	(62,574)	3,512		(67,163)	4,087
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Revenues	0	0		0	0
Costs and expenses:
Operating Costs	0	0		0	0
Depreciation and amortization	0	0		0	0
General and administrative	(138)	(138)		(276)	(276)
Intercompany leasing	0	0		0	0
Bad debt expense	0	0		0	0
Impairment charges	(750)			(750)
Gain on dispositions of property and equipment	0	0		0	0
Gain on litigation					0
Total costs and expenses	(888)	(138)		(1,026)	(276)
Income (loss) from operations	888	138		1,026	276
Other income (expense):
Equity in earnings of subsidiaries	133,082	(23,219)		143,134	(36,679)
Interest expense, net of interest capitalized	0	0		0	0
Loss on extinguishment of debt		0			0
Other	(138)	(138)		(276)	(276)
Total other (expense) income	132,944	(23,357)		142,858	(36,955)
Income (loss) before income taxes	133,832	(23,219)		143,884	(36,679)
Income tax (expense) benefit	0	0		0	0
Net loss	133,832	(23,219)		143,884	(36,679)
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Revenues	0	0		0	0
Costs and expenses:
Operating Costs	0	0		0	0
Depreciation and amortization	346	356		695	625
General and administrative	5,685	6,800		10,760	13,535
Intercompany leasing	0	0		0	0
Bad debt expense	0	0		0	0
Impairment charges	0			0
Gain on dispositions of property and equipment	0	0		0	0
Gain on litigation					2,876
Total costs and expenses	6,031	7,156		11,455	11,284
Income (loss) from operations	(6,031)	(7,156)		(11,455)	(11,284)
Other income (expense):
Equity in earnings of subsidiaries	(70,508)	19,707		(75,971)	32,592
Interest expense, net of interest capitalized	(5,135)	(10,707)		(10,590)	(23,106)
Loss on extinguishment of debt		(14,595)			(22,482)
Other	(2)	7		7	10
Total other (expense) income	(75,645)	(5,588)		(86,554)	(12,986)
Income (loss) before income taxes	(81,676)	(12,744)		(98,009)	(24,270)
Income tax (expense) benefit	3,645	12,425		7,959	21,372
Net loss	$ (78,031)	$ (319)		$ (90,050)	$ (2,898)